added table 'information_schema.table_partitions'

~~note: do not merge yet.~~
~~see sql/src/test/java/io/crate/integrationtests/InformationSchemaTest.java line 744:~~
~~STRING_ARRAY do not get transformed correctly yet.~~
Does not apply anymore because requirements have changed.

~~also, try to merge #648 before merging this one.~~
(done)